airtight

[ air-tahyt ]

/ ˈɛərˌtaɪt /

preventing the entrance or escape of air or gas.

having no weak points or openings of which an opponent may take advantage: an airtight contract.

Origin of airtight

First recorded in 1750–60; air¹ + tight

air·tight·ly, adverb air·tight·ness, noun

But good luck convincing other countries that the case against North Korea is airtight.

Cyberwar on North Korea Could Be Illegal |Shane Harris |December 23, 2014 |DAILY BEAST
But the mystery unfolds over an airtight 22 minutes, not a laborious 8.5 hours.

Why ‘Arrested Development’s’ Fourth Season Is a Bust: Contracts and More |Marlow Stern |May 28, 2013 |DAILY BEAST
As a reporter for nearly 40 years, I know an airtight story when I see one.

Philly Sportswriter Bill Conlin's Shame: Accused of Child Molestation |Buzz Bissinger |December 22, 2011 |DAILY BEAST
Refrigerate in an airtight container; will keep for up to one month.

Lights, Camera, Cocktails |Brody Brown |August 5, 2011 |DAILY BEAST

Place all ingredients in an airtight container and allow 12 to 24 hours for the infusion process.

Film-Inspired Cocktails: Sucker Punch |Brody Brown |March 26, 2011 |DAILY BEAST
Most canoes have airtight compartments fore and aft—that is, at both ends—and the boat itself is then a good life-preserver.

Boat-Building and Boating |Daniel Carter Beard
Phillips carefully closed the airtight hatch as they left, then followed the others in search of the galley.

This World Must Die! |Horace Brown Fyfe
The bodies had been walled in well enough, but those walls were not airtight.

The Iron Ration |George Abel Schreiner
It was not airtight, but there would probably be no further investigation.

The Perfectionists |Arnold Castle
Airtight doors slammed throughout the wounded vessel, and I drove her to the attack again, hard.

The Peacemaker |Alfred Coppel

airtight

/ (ˈɛəˌtaɪt) /

not permitting the passage of air either in or out

having no weak points; rigid or unassailable this categorization is hardly airtight